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powerlaw ⚬ˣˢᵖᵉᶜ｜Documentation｜1st｜20251021150803-00-⌔

powerlaw, zpowerlw: power law photon spectrum

powerlaw, zpowerlw: power law photon spectrum

powerlaw is a simple photon power law. The zpowerlw variant computes a redshifted spectrum.

$A(E)=K{E}^{-\alpha }$

where:

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For zpowerlw the formula and corresponding parameters are:

$A(E)=K[E(1+z){]}^{-\alpha }$

where:

📊 ➺

If POW_EMIN and POW_EMAX have been defined by the xset command then the norm becomes the flux in units of $10^{-12}$ ergs/cm${}^2$/s over the energy range (POW_EMIN, POW_EMAX) keV unless POW_EMIN = POW_EMAX in which case the norm becomes the flux density in micro-Jansky at POW_EMIN keV. In these cases it is important that POW_EMIN and POW_EMAX lie within the energy range on which the model is being evaluated.

Printed 2026-06-28.

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